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单选题
What does ALTITUDE refer to?
A
The horizontal distance from mean sea level to a plane, point or object considered as a point
B
The vertical distance from mean sea level to a plane, point or object considered as a point
C
The horizontal distance from the ground to a plane, point or object considered as a point
D
The vertical distance from the ground to a plane, point or object considered as a point
答案解析
正确答案：B
